Troubleshooting; Table 14 Troubleshooting Guide - Liebert InteleCool 2 User Manual

8.0 T
ROUBLESHOOTING
Table 14 Troubleshooting guide
Problem
Unit will not start
No cooling
Unit cycles on
high pressure switch
Heat does not operate
Probable Cause
No power to unit Check voltage to input circuit breaker.
Control voltage circuit Locate short and reset breaker.
breaker open
Shut off by external Check operation of thermostat.
thermostat or stat is
defective
Low refrigerant Check with gauges.
charge
Compressor contactor Check voltage at contactor. If not present refer to print and determine
not pulling in voltage loss. Check enthalpy sensor for full CCW or D setting.
No output from Check operation of stat. Should have voltage output to Y terminal during
thermostat cooling.
Loss or restriction of Check condenser blower assembly for proper operation. Check for dirty
air flow coil or inlet grille restriction.
Switch should make @ 240 PSIG ±10 (1655 kPa ±68.9). (Check settings
Defective fan cycling
control on adjustable switch when supplied.)
No voltage output Check stat for proper output to W terminal.
from thermostat
Fuseable link blown Check for open and replace.
Bad contactor Check for open and replace.
Remedy
27

Troubleshooting